Wind Power Network News: September 19, sponsored by the Wind Energy Professional Committee of China Renewable Energy Society, undertaken by CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., Goldwind Technology, Envision Energy, Mingyang Smart Energy, Haizhuang Wind Power, Schneider Electric The co-organized “2019 3rd China Wind Power Equipment Quality and Reliability Forum” was held in Zhuzhou.
Chen Qiang, senior engineer of computational analysis of NGC, attended the conference and delivered a keynote speech entitled “Reliability Design Measures and Calculation Methods of Wind Power Main Gearboxes”. The following is the full text of the speech:
Chen Qiang: Hello, everyone. I come from the calculation and analysis department of NGC. Reliability calculation is in our department. It is mainly responsible for quantitative calculation. This is also the focus of my introduction today. Simply mention our company. I believe that in the industry, There is also a certain degree of popularity. At the end of this month, it is the celebration of our 50th anniversary. We achieved good results last year. We are currently ranked in the top 100 machinery industry in the country in 2018. We are ranked 45. In terms of wind power products, we have now formed With standardized brands ranging from 1.5 MW to 6 MW, and a series of products, we currently have more than 60,000 sets of wind power main gearboxes in operation. In this respect, we are doing reliability in comparison with our competitors. Analysis has a big advantage.
I am going to first introduce the development trend of our current main gearbox design, and then give an overview of our current reliability design measures. Today, with this opportunity, we learned in detail that our wind power industry is facing the impact of the parity policy, and we have also endured the pressure passed on to our main gearbox. At present, we are developing towards high torque density, high reliability, and light weight. However, we have achieved this level. We are already in the core technology field at a stage comparable to domestic and foreign competitors. We believe that these three In terms of words, they complement each other. In terms of technical means, we use increasing torque density as a technical means, as well as light weight to promote low cost.
In order to introduce the current development accuracy and development trend of torque density, I quoted a paper from an international conference. In this paper, an engineer from Siemens gave a speech and introduced the main gearbox of wind power in the past ten years. It is the trend of torque density development. Five years ago, we were mainly making 2 MW models. At that time, it was mainly a technical route of one-level planetary-star and two-level parallel stages, ranging from 100 to 110. After entering 2 MW to 3 MW, we have converted to a two-level planetary-star level and one-level parallel level technology route. On this basis, we have tried to increase the number of planetary wheels from three to four. The mainstream is still four. Now five and six have been tried, but after five and six, many new problems have arisen. One is the challenge to the planetary gear bearing, whether it is some design calculations we have done, or If we look at a bearing sample plan obtained in reality, it will affect our design plan. For one, the bearing contact pressure will increase a lot. Usually, it is difficult to find a plan that meets the design specifications. On the other hand, due to the increase in size, the outer diameter of the gear box increases. Regarding these two points, one is that we have made some matching in the gear scheme, and the other is that our application in sliding bearing technology can also solve this problem to a certain extent.
In terms of design, we are now focusing more on gears and gears. We have done some expansive research and have achieved certain application results. Another point I have to mention is that we are now getting deeper and deeper with the structure chain plan, and we have now established a complete calculation process for the structure chain.
Post time: Dec-16-2021
